Why is it important to have a negative control using water

Water is commonly used by a negative control in chemical tests, especially distilled water. The distilled water is devoid of any minerals or salt, unlike regular water (or tap water) and hence is not likely to participate in any chemical reaction.

option a and d is the correct answer

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he movement of air through earth's or any planet's atmosphere is called wind, and the main cause of earth's winds is uneven heating by the sun. this uneven heating causes changes of atmospheric pressure, and winds blow from regions with high pressure to those with low pressure.

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